Windmill



FIG. 1 is a perspective view of a windmill showing my new design;

FIG. 2 is a front elevational view thereof on an enlarged scale;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof, the right side being substantially a mirror image. 

The ornamental design for a windmill, as shown and described. 